CHH Problem 18.61 Problem 18.61 How much energy is stored in the capacitor befor

Question

CHH Problem 18.61 Problem 18.61 How much energy is stored in the capacitor before the delechric is inserted? A11.5F capactor isconnected to a-supply that eeps a constant potential difference of 26 0 V across he plates A piece of material having a dielecti constant of 3.75 is placed between the plales completely filing the space between them -299 Mr Answers Give Up Incorrect: Try Again; 4 attempts remaining How much energy is stoned in the capacitor ater the dielectric is inserted? My Answers Give Up Part C Byhow much did te ergy change during te insertion? 8 2 4

Explanation / Answer

(A) Ui = C V^2 /2

= (11.5 x 10^-6) (26^2) / 2

= 3.89 x 10^-3 J

(B) C' = k C = 3.75 x 11.5 uF = 43.1 uF

Uf = (43.1 x 10^-6) (26^2) / 2

= 9.72 x 10^-3 J

(C) change in energy = Uf - Ui

= 5.83 x 10^-6 J

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